Apparatus for manufacturing endless grinding bands



July 20 1926. 1,592,957

R. NICKEL APPARATUS FOR MANUFACTURING ENDLESS GRINDING BANDS Filed Feb. 4. 1925 lfyd.

Patented July 20, 1926.

UNITED, STATES RICHARD NICKEL, 0F I OTSDAM, GEBMANY.

APPARATUS FOR MANUFACTURING ENDLESS GRINDING BANDS.

Application filed February 4, 1925, Serial No. 6,906, and in Germany June 23, 1924.

The endless grinding or so-called sanding bands employed now-a-days in many branches of industry are manufactured in this way that bands provided with a layer or coating of the respective abrasive, such as 'carborundum, corundum, emery, glass, flint, or the like, and consisting of a fabric, paper, leather, or the like, are turned into endless bands by connecting the ends with one another either by overlapping or by means of a separate connecting piece placed'below the then abutting ends.

This manner of manufacturing endless grinding or sanding bands is defective in that the band ends connected with one another in one or the other of the two man- 7 ners mentioned in the preceding paragraph the ends, and the connection is disconnected' The disadvantages and drawbacks experienced with endless grinding bands of the known kind are completely done away with by my present invention in which the abrasive is ap lied to bands which are endless from the ginning, having, therefore, no

. joint, there being manufactured as first stage an endless band (produced, perhaps, by cutting off .a piece of suitable axial length from a hose-like fabric), which then is coated with an agglutinant (second stage), hereafter covered with the abrasive (third stage), and finally either left to itself or exposed to moderate heat (fourth stage) in order to become dry.

In order to make my invention more clear, I refer to the accompanying drawings in which Figure 1 is a perspective view of an endless band not yet provided with the abrasive layer; Figure 2 is a cross section through this band; Figure 3 is a view similar to Fig. 1 showing the band provided with the abrasive layer,-finished for use; Figure 4 is a cross section through this band; Figure 5 is a side-view of a machine serving for applying the agglutinantto the band; and Figure 6 is a side-view of a machine serving for applying the abrasive to the band. this figure being drawn to a reduced scale rclatirclj to Fig. all as more fully described hereinafter.

The Figures 1, 2, 3, and 4, require obviously no detailing description after the eluf hinged at f -to the frame, and the upper roll is carried by a similar lever g hinged at g to said frame. Outside their fulcrums f and g the levers f and g are provided with counterpoises h and il but the lower lever is ordinarily checked by a pin 2' by which it is then coupled to the frame.

The manner of operation of this machine is as follows:

The basin I) is provided with a sufiicient quantity of the liquid agglutinant and the roller 0 is rotated by the cogewheel gearing 'w 'w The pinion w which forms a part of this gearing is driven by any available source of power. The rotation of the cogwheel'c is transmitted to the roll 6 by means of a cog-wheel '10 whereby the endless band 01 is caused to travel round. While moving in this way it is provided with a layer of the liquid agglutinant by the roller 0. This having been accomplished the pin z' is withdrawn, in consequence whereof the levers f and g are swung upwards by the counterpoises h and it, this motion being limited by an abutment j co-operating with the righthand-arm of the lever 9. Owing to said upward motion the gearing between the cog-wheels w and w is interrupted, and the three band-carrying rolls, together with the band, come to a stand-still. The band with its moist coating of .the liquid glue or the like is now removed from the rolls and a new one is put on in lieu of it.

The bands are now treated one after another in the apparatus illustrated in Fig. 6 in which they are provided with the abrasive as well as dried thereafter. n denotes a recepi acle containing the pulverulent abrasive. 0 is a distributing roll, and m m are rolls receiving the endless band d. The rolls are rotated slowly and the abrasive is at the same time distributed uniformly over and upon it. The completely covered bands are then taken off the rolls m m, and are I upon w liun g upon stationary rolls a or the like ich they are left until having become dry, the grinding or sanding bands being then ready for use.

I claim: 1 v1. An a paratus for manufacturing end- I less grinding bands, comprising, in combination: a basin adapted to receive a liquid agglutinant; a roller dipping into said basin, and means for rotatin said roller; rolls arranged to receive an en less band and'to cause it to contact with a part of the free circumferential surface of the roller; two

. levers arranged one over the other and having said rolls attached to them and being.

adapted to be swung in a vertical plane; and meansfor movin said levers in such a direction that the en ess band is moved ofi the said roller, substantially as described.

2. An apparatus for manufacturing end-" less grinding bands comprisin a supporting frame, an open top liqui agglutinant container, a rotatable roller havmga portion of its periphery proecting the y the-up rover the periphery of said roller to effect application of a liquid agglutinant, and. means to permit of vertical separation of the levers and grinding band with tlie rolls from said roller. 3. A structure as specified in claim 2;

said means comprising a removable pin 1nterconnecting one free end of the lower lever and the frame, and \counterbalancin weights adjacent corresponding ends of t e levers remote from said pin.

In witness wheredf I have hereunto set m hand.

y RICHARD NICKEL. 

